I was going to post the same last night but my ISP was being slow. I used WD 40 as an "oil" for many years and later learned that it is not an oil. White lithium grease (in a spray can just like wd40) does a much better job as a grease/oil than wd40. WD40 is what you use to clean the dirty lithium grease off when cleaning before a re-greasing.